/*

   Unix SMB/CIFS implementation.

   Core SMB2 server

   Copyright (C) Stefan Metzmacher 2009

   Copyright (C) Jeremy Allison 2021

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "includes.h"

#include "smbd/smbd.h"

#include "smbd/globals.h"

#include "../libcli/smb/smb_common.h"

#include "../lib/util/tevent_ntstatus.h"

#include "include/ntioctl.h"

#include "smb2_ioctl_private.h"

#include "librpc/gen_ndr/ioctl.h"

#undef DBGC_CLASS

#define DBGC_CLASS DBGC_SMB2

struct async_sleep_state {

  struct smbd_server_connection *sconn;

  files_struct *fsp;

};

static void smbd_fsctl_torture_async_sleep_done(struct tevent_req *subreq);

static struct tevent_req *smbd_fsctl_torture_async_sleep_send(

        TALLOC_CTX *mem_ctx,

        struct tevent_context *ev,

        files_struct *fsp,

        uint8_t msecs)

{

  struct async_sleep_state *state = NULL;

  struct tevent_req *subreq = NULL;

  bool ok;

  subreq = tevent_req_create(mem_ctx,

        &state,

        struct async_sleep_state);

  if (!subreq) {

    return NULL;

  }

  /*

   * Store the conn separately, as the test is to

   * see if fsp is still a valid pointer, so we can't

   * do anything other than test it for entry in the

   * open files on this server connection.

   */

  state->sconn = fsp->conn->sconn;

  state->fsp = fsp;

  /*

   * Just wait for the specified number of micro seconds,

   * to allow the client time to close fsp.

   */

  ok = tevent_req_set_endtime(subreq,

            ev,

            timeval_current_ofs(0, msecs));

  if (!ok) {

    tevent_req_nterror(subreq, NT_STATUS_NO_MEMORY);

    return tevent_req_post(subreq, ev);

  }

  return subreq;

}

static files_struct *find_my_fsp(struct files_struct *fsp,

         void *private_data)

{

  struct files_struct *myfsp = (struct files_struct *)private_data;

  if (fsp == myfsp) {

    return myfsp;

  }

  return NULL;

}

static bool smbd_fsctl_torture_async_sleep_recv(struct tevent_req *subreq)

{

  tevent_req_received(subreq);

  return true;

}

static void smbd_fsctl_torture_async_sleep_done(struct tevent_req *subreq)

{

  struct files_struct *found_fsp;

  struct tevent_req *req = tevent_req_callback_data(

          subreq,

          struct tevent_req);

  struct async_sleep_state *state = tevent_req_data(

          subreq,

          struct async_sleep_state);

  /* Does state->fsp still exist on state->sconn ? */

  found_fsp = files_forall(state->sconn,

         find_my_fsp,

         state->fsp);

  smbd_fsctl_torture_async_sleep_recv(subreq);

  TALLOC_FREE(subreq);

  if (found_fsp == NULL) {

    /*

     * We didn't find it - return an error to the

     * smb2 ioctl request. Use NT_STATUS_FILE_CLOSED so

     * the client can tell the difference between

     * a bad fsp handle and

     *

     * BUG: https://bugzilla.samba.org/show_bug.cgi?id=14769

     *

     * This request should block file closure until it

     * has completed.

     */

    tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);

    return;

  }

  tevent_req_done(req);

}

struct tevent_req *smb2_ioctl_smbtorture(uint32_t ctl_code,

           struct tevent_context *ev,

           struct tevent_req *req,

           struct smbd_smb2_ioctl_state *state)

{

  NTSTATUS status;

  bool ok;

  ok = lp_parm_bool(-1, "smbd", "FSCTL_SMBTORTURE", false);

  if (!ok) {

    goto not_supported;

  }

  switch (ctl_code) {

  case FSCTL_SMBTORTURE_FORCE_UNACKED_TIMEOUT:

    if (state->in_input.length != 0) {

      tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);

      return tevent_req_post(req, ev);

    }

    state->smb2req->xconn->ack.force_unacked_timeout = true;

    tevent_req_done(req);

    return tevent_req_post(req, ev);

  case FSCTL_SMBTORTURE_IOCTL_RESPONSE_BODY_PADDING8:

    if (state->in_input.length != 0) {

      tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);

      return tevent_req_post(req, ev);

    }

    if (state->in_max_output > 0) {

      uint32_t size = state->in_max_output;

      state->out_output = data_blob_talloc(state, NULL, size);

      if (tevent_req_nomem(state->out_output.data, req)) {

        return tevent_req_post(req, ev);

      }

      memset(state->out_output.data, 8, size);

    }

    state->body_padding = 8;

    tevent_req_done(req);

    return tevent_req_post(req, ev);

  case FSCTL_SMBTORTURE_GLOBAL_READ_RESPONSE_BODY_PADDING8:

    if (state->in_input.length != 0) {

      tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);

      return tevent_req_post(req, ev);

    }

    state->smb2req->xconn->smb2.smbtorture.read_body_padding = 8;

    tevent_req_done(req);

    return tevent_req_post(req, ev);

  case FSCTL_SMBTORTURE_FSP_ASYNC_SLEEP: {

    struct tevent_req *subreq = NULL;

    /* Data is 1 byte of CVAL stored seconds to delay for. */

    if (state->in_input.length != 1) {

      tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);

      return tevent_req_post(req, ev);

    }

    if (state->fsp == NULL) {

      tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);

      return tevent_req_post(req, ev);

    }

    subreq = smbd_fsctl_torture_async_sleep_send(

            req,

            ev,

            state->fsp,

            CVAL(state->in_input.data,0));

    if (subreq == NULL) {

      tevent_req_nterror(req, NT_STATUS_NO_MEMORY);

      return tevent_req_post(req, ev);

    }

    tevent_req_set_callback(subreq,

          smbd_fsctl_torture_async_sleep_done,

          req);

    return req;

        }

  default:

    goto not_supported;

  }

not_supported:

  if (IS_IPC(state->smbreq->conn)) {

    status = NT_STATUS_FS_DRIVER_REQUIRED;

  } else {

    status = NT_STATUS_INVALID_DEVICE_REQUEST;

  }

  tevent_req_nterror(req, status);

  return tevent_req_post(req, ev);

}